June 23- JetBlue Airways Corp on Tuesday said it will add its premium "Mint" class to transcontinental flights from Boston, the first new city for a service that JetBlue credits with helping it steal share from competitors. JetBlue will offer Mint service, the airline's answer to first and business class, on flights from Boston to San Francisco starting March 2016...

MIAMI, June 7- A positive trend in April traffic at Germany's Lufthansa continued in May with new business class and premium economy seats attracting passengers, Chief Executive Carsten Spohr said on Sunday. "When it comes to safety, Lufthansa has a reputation for safety, which has not been hurt or damaged by this tragic accident," said Spohr, speaking to reporters...